Bibcode
Planck Collaboration; Aghanim, N.; Arnaud, M.; Ashdown, M.; Aumont, J.; Baccigalupi, C.; Balbi, A.; Banday, A. J.; Barreiro, R. B.; Bartelmann, M.; Bartlett, J. G.; Battaner, E.; Benabed, K.; Benoît, A.; Bernard, J.-P.; Bersanelli, M.; Bhatia, R.; Bock, J. J.; Bonaldi, A.; Bond, J. R.; Borrill, J.; Bouchet, F. R.; Brown, M. L.; Bucher, M.; Burigana, C.; Cabella, P.; Cantalupo, C. M.; Cardoso, J.-F.; Carvalho, P.; Catalano, A.; Cayón, L.; Challinor, A.; Chamballu, A.; Chiang, L.-Y.; Chon, G.; Christensen, P. R.; Churazov, E.; Clements, D. L.; Colafrancesco, S.; Colombi, S.; Couchot, F.; Coulais, A.; Crill, B. P.; Cuttaia, F.; da Silva, A.; Dahle, H.; Danese, L.; de Bernardis, P.; de Gasperis, G.; de Rosa, A.; de Zotti, G.; Delabrouille, J.; Delouis, J.-M.; Désert, F.-X.; Diego, J. M.; Dolag, K.; Donzelli, S.; Doré, O.; Dörl, U.; Douspis, M.; Dupac, X.; Efstathiou, G.; Enßlin, T. A.; Finelli, F.; Flores-Cacho, I.; Forni, O.; Frailis, M.; Franceschi, E.; Fromenteau, S.; Galeotta, S.; Ganga, K.; Génova-Santos, R. T.; Giard, M.; Giardino, G.; Giraud-Héraud, Y.; González-Nuevo, J.; González-Riestra, R.; Górski, K. M.; Gratton, S.; Gregorio, A.; Gruppuso, A.; Harrison, D.; Heinämäki, P.; Henrot-Versillé, S.; Hernández-Monteagudo, C.; Herranz, D.; Hildebrandt, S. R.; Hivon, E.; Hobson, M.; Holmes, W. A.; Hovest, W.; Hoyland, R. J.; Huffenberger, K. M.; Hurier, G.; Jaffe, A. H.; Juvela, M.; Keihänen, E.; Keskitalo, R.; Kisner, T. S.; Kneissl, R. et al.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 536, id.A9
Fecha de publicación:
12
2011
Revista
Número de citas
137
Número de citas referidas
128
Descripción
We present the XMM-Newton follow-up for confirmation of Planck cluster
candidates. Twenty-five candidates have been observed to date using
snapshot (~10ks) exposures, ten as part of a pilot programme to sample a
low range of signal-to-noise ratios (4 < S/N < 6), and a further
15 in a programme to observe a sample of S/N > 5 candidates. The
sensitivity and spatial resolution of XMM-Newton allows unambiguous
discrimination between clusters and false candidates. The 4 false
candidates have S/N ≤ 4.1. A total of 21 candidates are confirmed as
extended X-ray sources. Seventeen are single clusters, the majority of
which are found to have highly irregular and disturbed morphologies
(about ~70%). The remaining four sources are multiple systems, including
the unexpected discovery of a supercluster at z = 0.45. For 20 sources
we are able to derive a redshift estimate from the X-ray Fe K line
(albeit of variable quality). The new clusters span the redshift range
0.09 ≲ z ≲ 0.54, with a median redshift of z ~ 0.37. A first
determination is made of their X-ray properties including the
characteristic size, which is used to improve the estimate of the SZ
Compton parameter, Y500. The follow-up validation programme
has helped to optimise the Planck candidate selection process. It has
also provided a preview of the X-ray properties of these
newly-discovered clusters, allowing comparison with their SZ properties,
and to the X-ray and SZ properties of known clusters observed in the
Planck survey. Our results suggest that Planck may have started to
reveal a non-negligible population of massive dynamically perturbed
objects that is under-represented in X-ray surveys. However, despite
their particular properties, these new clusters appear to follow the
Y500-YX relation established for X-ray selected
objects, where YX is the product of the gas mass and
temperature.
Corresponding author: E. Pointecouteau, e-mail:
etienne.pointecouteau [at] irap.omp.eu (etienne[dot]pointecouteau[at]irap[dot]omp[dot]eu)
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